Extended Data Fig. 6: Comparison with BPASS evolution models.
From: Discovery of a transitional type of evolved massive star with a hard ionizing flux
HRDs with the best-matching BPASS v2.2.1 (Eldridge et al. 2017, Stanway & Eldridge 2018 single (grey) and binary (light purple) tracks for each of the analyzed WN/WO (yellow) and WN2 stars (blue). For binary solution, the secondary track is indicated by a dashed path. The combined luminosity of primary and secondary is indicated by a semi-transparent filled circle. Error bars for the observed WR stars are derived from acceptable spectral reproduction within a sample of at least 100 star-specific models.
